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  • GROUND SUPPORT SYSTEMS AND FACILITIES (SPACE)  (1)
  • MATERIALS, NONMETALLIC  (1)
  • 1
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    Microparticle accelerator of unique design (1978)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: A microparticle accelerator has been devised for micrometeoroid impact and cratering simulation; the device produces high-velocity (0.5-15 km/sec), micrometer-sized projectiles of any cohesive material. In the source, an electrodynamic levitator, single particles are charged by ion bombardment in high vacuum. The vertical accelerator has four drift tubes, each initially at a high negative voltage. After injection of the projectile, each tube is grounded in turn at a time determined by the voltage and charge/mass ratio to give four acceleration stages with a total voltage equivalent to about 1.7 MV.
    Keywords: GROUND SUPPORT SYSTEMS AND FACILITIES (SPACE)
    Type: Review of Scientific Instruments; 49; Jan. 197
    Format: text
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 2
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    Microcraters formed in glass by low density projectiles (1971)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Microcraters were produced in soda-lime glass by the impact of low density projectiles of polystyrene (p = 1.06 g/cu cm) with masses between 0.7 and 62 picograms and velocities between 2 and 14 km/s. The morphology of the craters depended on the velocity and the angle of incidence of the projectiles and these are discussed in detail. It was found that the transitions in morphology of the craters formed by polystyrene spheres occurred at higher velocities than they did for more dense projectiles.
    Keywords: MATERIALS, NONMETALLIC
    Type: NASA-TM-X-67469
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
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